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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f482a678118178fea7f4c322a2afc546364c9fba7675632d477d69a11898b6' 
  AND token = 'OF+co6oJHxo24/okEEbkBcW/i94ZdZiUjaEKxH6IhjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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