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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df7d0ebc5fda303625b4396df8a23ed8f8dfe2ca8317e21c025b8052aa5e162' 
  AND token = 'vyPo6iLVpxpCmmn2dDOy5hBND5Rn8IAkb9+BFJYeIPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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