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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b546c10575189bac2383f0e726a0409753be1bd9c4aad1f2a224c4009235235' 
  AND token = 'NRM/Da0IOlkGotA2VYXvhKnYtAy2ccLfwab4OPpzZrs=' 
  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"
    }
  }
}