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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e14d9c40be507111a5bbdaacf5ade17f8c85525c84bb347877ebd965a5c5e7' 
  AND token = 'yaht3eHrzeNIMWD0iizLNFb430jKwGZKONlhyN1JSxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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