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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30d2223a2da3fdd0e98e854c0c5ad887da48c6bd5a9b7e05185908027dac2ec' 
  AND token = 'KKawHRZk+V5YHOeDD1DbpBoiCTerbe4bWUieIZZxmkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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