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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e946f756b5833a8cbd3b0793100fcf45bd585ecd3408bcd62b24f96ce5caf9' 
  AND token = 'OL94dxKSt1bWccfn/St0Y1ftuUNs8/eFvE02Ukz+G/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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