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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70e2bdae7b8812379206cdf9c01dd5b47c81c925e771c7e8bfb4e479f0c42d3' 
  AND token = '5xuX54wXef5SbSJZ9mpaxNhWYrNja6e2R90Yw0mz4hs=' 
  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"
    }
  }
}