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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f1dbf31ef6ec8e1eb0c81443339a52a9bf58e8654475c1a3ec4606f1acb396' 
  AND token = 'kMj2C7W9MEqXBOCFziPC2evbtgDO8N3I0XEsc5TXsyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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