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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea49ea9caff78a9774c4217f55f4e21b1a14329f99e5b0fc52ab7681885f60f' 
  AND token = 'MvcfAw3Yj3Z0RAllNz7OM48K1bgKcvGitIkTCPZrzfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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