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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be14db82d8435f07f79fa887459ab8fa2d26357725576b5836761d07b0703840' 
  AND token = '5mZ8ggznA8uulUUBQ60aAy/5TJZ6IbSWYb/XzoN7rsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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