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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81e252480f72003d134976a50e31e04d9acc834f106da0350a04a4b22a6f7e91' 
  AND token = '13Qnk2Hg+gpdCjM1DqkgD9fXGI97KS+7QQFghLdRd0Q=' 
  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"
    }
  }
}