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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '304dd93a336d30cffd991c5377874075d927de81c495d1ad98b632e9434929bb' 
  AND token = 'MgINvhgfCXroINdjFB/ylashWi3Em1jhl8w/c8o0O9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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