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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a4d58d1280b7e946273e32874ce3dc7d0b420e7d5fd661a92636b3ba46ead9f' 
  AND token = 'KHeMGO1kq6c+EOc2XV+VmW1a/vaT+jz5mho75nQuLxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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