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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edaeceea309b67bf487c1fa74b6460f27a3c25ab3152cf8ea7fcdd027d85a62d' 
  AND token = 'iv6aZzr31Yu0gBlPAUBEdRYlFyY8s/P5laqQ14hDYSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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