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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6df19d8aa750177c4c5a4e293b22f40e9d3d9c67bc0e860e0c94caeb4256c6' 
  AND token = '8FMicNha9g7q/2cbe6DBQpTWXJMbtL8yOTtO2QUA8+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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