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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9e2a53e2f1f97ee8392df4f833b0f4f4279921e11aec1ffa04463d210660e0' 
  AND token = 'xTVi+E37YAFN1jR1l+B1ZWg+MRN/iieVwwHJaBpzJ4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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