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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f2697fe3f74f1ee9d1c476c27c51f2830d1398070479d9db2ff990844b7e467' 
  AND token = 'aYy+Qtcnry9LG8gmwP1e+rT1RMdEz79uHMW88yMsiOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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