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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc31d91209382ecac35de9b2ff1cee67a42c230dd917d590f10e1ab45ea20bec' 
  AND token = 'Cn7cexduoBDAadXMmRsfKQyQCB+lao1wEDyVBSvDBeQ=' 
  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"
    }
  }
}