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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0635de848f98d5f33c860fb2af748ac30da1a5cd7525ad7d64054d29d58b0c25' 
  AND token = '7VPkCYKQcokm4sIcCaRf5+kHlj6w4nphcdIzvK5kMEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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