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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7694f503d3f3d4518fb8abfe5ab1f7880b8df81ef8ec435eb0a11996672bf80a' 
  AND token = 'LQ4OwXBHCz24RX181QaZOVUrsXb1pxdqVFsilFgztho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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