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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95aa9b98c2ce1257c8c0cb0f93a05c93b2a3a01244fd4ead2018b2c51c601488' 
  AND token = 'LeI/lbl/UT15tUSF/cFuCalFXTVPQZFfQlqZIvtsq0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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