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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffd52c976f83188573caec8c6531e0ed7e90a2f62e4f48600389af5effdfa2f' 
  AND token = 'TUSfdu/UO94BphMLID6DNYkqAMnT2vNn6oi5J3oh3w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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