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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0841d185273e547ee56c9b3238f747a75ec907700e1a0012081626ea6eacd6' 
  AND token = '0BqMJugeDLpu9HSnsmo75xzLM1fnJuF+lHuSkOxu2G8=' 
  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"
    }
  }
}