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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6791e3088c3e8ee60e130098628389b738093fde99f920412c5c20d63b970afe' 
  AND token = '1188sE4hRkQG5vJe8Na00AZsknDp75HUfVen3at5zQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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