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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de87ba8e6cbadcd6f64d6d5cb8fa7d394a680cc2b14ef00f5d36dbdbf32e8f2' 
  AND token = 'qHCtlLfgMjWUyI+IILxi18Kx3PtIg4uFa95+Hwe1mlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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