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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3569f61e82234779d9c2dba3d2af30f22424705296773bf9a9d2c6ed33ee3bf5' 
  AND token = 'yHhBk38MVYQ6DMLTLwzozV+SD8sLL3tPwvXCR8yAML4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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