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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7dc4a70c037df2bccc4a0bb2671783cf4baebc3ab05c5a574e19106d5deaf1' 
  AND token = 've5sGHZ2/aOUclHZU5NASNTLJX2ysSVDf4S6qBA7YIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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