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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea24b5524cb1383d9be32177241098ee691cc35f396fa588d3170d09119c1bae' 
  AND token = '69m3rADVt4dR1fsxLCS0Gej6iZGlgt1jIl3mO1NprOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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