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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35298ef3ae2b28782e753e30cb29595812e8bb84019a02a3da5cda596a8102b7' 
  AND token = 'c9O2LQB7UL7PWKA3d9XFT4Br/J4mEWTniGJ7lmOuHJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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