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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '601a16d457f6c475794cc7a7afa25d0cb236f092a0bfedc7036a507fca46011b' 
  AND token = '4WXHBd2d71nFINY9weeCfIWMOQgtdhGcr9fW6Aa2njw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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