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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a1daf3a44ddf183254ffa9cfb4ea25b72baa891df1cf0515338dc71e53bd14' 
  AND token = '1JeoEkuMBVk9pleZwur90uZAYL4IEBK9Qm/e4BlFfsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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