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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d3b14a996e8e6e1c5d85531c57ea5efb6acff7ca2e89e95c0237745d68f223' 
  AND token = '8jfzghmZaOkf7jXGrZB2pxiLF1fGIuPYjzB3M8FYt1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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