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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3737babca7cab8c59c747a248124e2d7acc564166e0b3e18ce8440312296a2' 
  AND token = 'osFO2IA6R3cUiz/6VkWEhoWlMaOg5Dx8yyfdXAEaWpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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