Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810d29780e54e6c914d7052e2b988e6059393ba4b05e0509e67a51b47f776975' 
  AND token = 'W8Wknr2bhBNQ7XF+Eh4jvJPYElVPibhODe86HF1AnuQ=' 
  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"
    }
  }
}