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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab1011c76415d6d184f11244af0e09f40fe15e157237a4487c1b18b43f15a3f' 
  AND token = 'hOKei/b57X6kfLjTKQizxwiDm8TtsaL5pKHnmsqqBRI=' 
  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"
    }
  }
}