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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d18861647907239afb5ff027453248a9f27cfe8a6d756ebd2f4fb308e03665d' 
  AND token = 'qYEePWIltEvkHLclgaZFS75q7kPG6wPn6nai9j5Y9uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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