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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666eb33b2c40a5c3e71e0bc0be567d81bb7c3cd1c8a0b667181179c71371f9be' 
  AND token = 'hRMovUYcMVg9AOt7JRI8uqkTertV2eb6wFic87OO8O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}