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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973703e27806eff6486bdc4f1f676b203f520095ade72bc1d26f39b721f9afda' 
  AND token = '0BM7EZjJ22f8pR+E/QgvtOkwB1w/xBt8LmogcAKk/Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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