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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5bb90862ed4ec7c49a57de4670d80b748f408413544de02a0dcd843b98f32f' 
  AND token = 'UWq9HkjlDQ8dxtQO+GIV55mAPYHkfb5ckj4Tgu8RqzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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