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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea999cda85a4909a3a8e9704328d3188b067065bdc9676cac4954aed2cfa6c4' 
  AND token = 'Tj80rtnPR+WTHglzlyC6lreVJBxXp9CuckRFlC2dC4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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