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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f673a7521d513e324d409b772a820f9844f5b8f3fbd660d999da002d872b45a' 
  AND token = 'EKlA41euKwmFlGjOgEp0c17wWrRYjQimZAZMTj2I9wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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