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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95cc93c9d46dec0711b0a8271d7fd2141da3ddaf30bd4426657a5bafbed8110' 
  AND token = '8LEMas/QMTkNx5ZjsidT7EfOWQ4kzL9ej2vatOEp5hM=' 
  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"
    }
  }
}