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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696d47239ef45ee33c92fcfadb9ac2e150df7d1a153502cd6d1f55c588eeec7e' 
  AND token = 'zAXt4NKAxbQkL/y+ZuT+Zf7eK6Qojh1L/Pu1eoGvJPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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