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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4512c8f292750993a724d3e969075d2edd217811656ecea2496d258c17b9d7f9' 
  AND token = 'Ik5sLxs7ij5YTqZdiHcdXhAutjAgDhl+WWUkAq0IGng=' 
  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"
    }
  }
}