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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4f69047fc449d9f9346978a5acba50e543b78a4b044a9142b350831240eb1b' 
  AND token = 'hnwAHd4S1Yb+kU2f5oVYfKlxeLZyMlUN6qMNozxb2FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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