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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7445214ea7323886963cf57b9ba56088992b643bdb20884a28d1bc67f6dd9c66' 
  AND token = 'xvTP7cPHyc64u7ZYDlGsxXw6T2J+VZ7t6C2EjG+9Xzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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