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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09eb21f8d29bb75f4a79f9a1d5a7fdb47dff0d619c576f8e3641f1941e645f4' 
  AND token = 'hcW7RUJq8Y03pdSkd5V9OS8G6DGAYGLh2hgcVg8jXxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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