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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7cd0dcbb5ff2cd6f306e788cc03de96cd5c12d50a731450990bbbc56082e1ba' 
  AND token = '/crEFWCjYDbgB43/7fpD75nmvEPeAA6WoWG6yrhnoPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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