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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6eeb273e605bc6b5d44f53ed95e03cff12b73e07825930b34a5d34f3ca5ac18' 
  AND token = 'TbwpsITGe2e0lPVdThfeFSkavNho7fDS45c12TGyHq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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