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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f8c9fa346045fbf5dfe78726caba8b57f24853228609a13a480a9a108aaaef' 
  AND token = 'UWmopQ79K6BAy22BNQKK3X6t2rLLOrW+c4GYkKgGiME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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