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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a757a8310511f622d9b6a2c7e1546ae3c087d37a3947ee4cd6b3fd5916b263f1' 
  AND token = 'KK0EzCrRuVVuX0riit74XdEkUJhXZnAWW3VdlwqGbik=' 
  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"
    }
  }
}