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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a1f5a567ee91486302f9c0bdceb92f17ab06828d7d93cbc85256341ef1ba37' 
  AND token = '+DPocssekr4oD2OnZ7z+Ow7hyyjgI0zqx+d2BweKR7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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