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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64d2636eef6065880ca110c84c8ac64da24949a6492dd0a70ec0eb40fcaf792b' 
  AND token = 'V01q34mmvfFAPHjeP65O8renA2QNbRvBXkKPsh93SJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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