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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f09551bb65bfe42442cb3959d2b9775222c48acfa42f325211f6aa9ebecdb8' 
  AND token = 'RvYTxZqXtbP1EBY5W/T7qL41NIGWrfQ/KBpZnDCx4GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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