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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b99da636450cd275f13241b35c3c97913fe112e22b75f228c8f5fb1a293fcc1' 
  AND token = 'uvrBB0099TUrj/K2eyZrjhkxZ2YGU0hyXW2Oi3eOjh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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