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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1550ea21aa55d0dcb0014a9723a8e59e9c3b4d161f4f0c351abe829c543304c7' 
  AND token = 'G5Ia+s84GmDu0kD8y2GpV82+AOkGzmXAD+OydwfGsz4=' 
  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"
    }
  }
}