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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5c548a0cd569a755ed25f532ef4ae4cb9c4fe7b1e4d7f6df7567e04e86843e' 
  AND token = 'OB4TI1IkkdOHjwAOKjnzdrfw2VZDroI/EQGUIv/5f14=' 
  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"
    }
  }
}