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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec308dd5cd8e659afc0567bf51395f0273838e98ce97158cb04be51e4934d17' 
  AND token = 'byDotkffH8VxSXHaYeOeFVJViH4HPWHc27nHLE4QSr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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